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about 5" over the edge of the work surface. Remove the
two exposed screws from the bottom panel. Rotate the
console 180° and remove the remaining two exposed
screws. Lift the cover straight up. When clear of the bottom
panel, rotate it until the cover rests on its rear bumpers.
This "open clamshell" position, with the bottom panel
horizontal and the cover vertical, provides access to all
internal parts and assemblies (see Figure 1).
When closing the console, reassemble as follows to
avoid damage. Remove the air filter (if not already re-
moved). Bend and position the left wiring harness to fold
on top of the PC board-fan assembly. Bend and position
the right wiring harness to fold between the fan and power
transformer, clearing the fan blades. Center the cover over
the bottom panel and lower the cover. With one side of the
console extending about five inches over the edge of the
work surface, replace four screws and washers in the ex-
posed bottom panel holes. Rotate the console so that the
other side extends over the edge of the work surface, and
replace four screws and washers. Raise the front of the
console so that it is sitting on the rear bumpers with the
handle upward and replace the remaining screws and
washers. NOTE: The screw next to the left handle mounting
bracket does not use a washer. Replace the air filter.
REVERB PAN
To remove the reverb pan (AlO), disconnect the input
and output leads from the reverb. Remove the screws and
nuts holding the unit to the bottom cover plate. The cover
plate and foam pads will remain in place. Secure the
replacement pan to the cover plate, making sure the side
of the reverb with the phono jacks faces the front of the
console. Reattach the leads previously removed.
If the console is to be operated with the reverb pan re-
moved, make sure the associated leads are not free to
short out any other wiring. Insulate and tie down the two
reverb cables and ground lead.
PRINTED CIRCUIT BOARDS
The console's printed circuit boards are mounted by
various methods. The following paragraphs describe the
best method of removing each board after cable connec-
tors and connecting wires have been removed. IMPOR-
TANT: When disconnecting cable connectors or soldered
wire connections, make sure connectors or wires are iden-
tified for proper reconnection. This may be done by affix-
ing a piece of masking tape marked with the reference
designation (connectors) or terminal letter or color (wires).
Similar wire colors are used in different circuits;
make sure proper re-connections can be made.
Push-on connectors must be removed by pulling
straight out from printed circuit board surfaces. Do
not apply side force when removing or reconnecting
terminals, or damage may result.
Refer to Figure 1 for the location of each board. The
function of each board is given in the following table.
Board
No.
Function
Input Controls (Ch. 1-6)
A1
Equalizer
A4
Regulated Power Supply
A5
A6
Power Amplifier (2)
A7
Output Connectors
A8
Input Connectors
A9
Output Controls
A l l
LED Board
A magnetic screwdriver is recommended for removing
boards secured with screws. When removing front-panel
jack retaining nuts with a
ful not to damage the surface around the jack. Boards or
parts secured with nylon standoffs may be removed by
using a long-nose pliers to squeeze the locking lugs of the
nylon standoffs on the circuit board side, and sliding the
board outward and off the standoffs. The printed circuit
board connectors can be reconnected for testing purposes
after disassembly from the cover or bottom panel.
lnput Controls (Ch. 1-6) and lnput Connectors Boards (A1
and A8): These boards must be removed at the same time.
Remove the knobs from the left (Input Controls) side of the
front panel. Remove the nine retaining nuts and washers
from the front-panel phone jacks (note that the HEAD-
PHONES jack-J815-has
the metal washer.) Remove connectors J1 and J21 from
the lnput Connectors board and connector J2 from the
lnput Controls board. Remove connectors J24 and J25
from the Output Controls board.
Use a long-nosed pliers to release the locking lugs on the
board standoffs. As each standoff locking lug is released,
push the potentiometer shaft in the vicinity of the standoff
to disengage the board. Repeat this procedure for each of
10 standoffs. As the lnput Controls board is disengaged
from the standoff, all the pot shafts except the six closest
to the lnput Connectors board will fall clear of the top
cover. Using the tips of the long-nosed pliers (or any blunt
object that will clear the pot clearance holes in the cover),
push the six remaining pot shafts through the top cover.
After the lnput Controls board has been disengaged, free
the three phone jacks on the right hand side from the top
cover by grasping the body of the HEADPHONES jack with
the thumb and forefinger, and pulling downward until the
bushing is free from the top cover. Repeat for the AUX
INPUT 7 and AUX INPUT 8 jacks. Free the left side of the
lnput Connectors board by inserting a medium-size screw-
driver between the input alignment bracket and the cover.
Start at Channel 6 and lift the screwdriver handle, freeing
the &pin connector and phone jack from the top cover.
Repeat for all six channels. When all six channels have
been freed, the lnput Connectors board and the lnput
Controls board may be lifted out for service.
To reassemble, first make sure that the LEDs are prop-
erly positioned. Position the lnput Connectors board in the
top cover (do not assemble nuts or washers at this time).
Position the lnput Controls board at the approximate loca-
tion of the standoffs. The six rotary pot shafts closest to the
front should be visible through their respective clearance
holes when viewed from the top of the cover. Reach
through the respective clearance holes from the outside
of the top cover using a hooked tool (or a formed paper
Component
Numbering
100s, 200s, 300s
400s
500s
600s
700s
800s
900s, 1000s
1 100s
nutdriver or wrench, be care-
Y2"
an insulating washer behind
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